Mechanism for coloring and etching paper webs and the like and method thereof



Feb. 19, 1929. 1,702,268

H. PALM MECHANISM FOR COLORING AND ETGHING PAPER WEBS AND THE LIKE AND METHOD THEREOF Filed Aug. 17, 1925 Hermann Pa Zm Patented Feb. 19, 1929.

UNITED STATES 1,702,268 PATENT OFFICE.

HEB-MANN PALM, 0] NEUKOCHEN, NEAR UNTEBKOCHEN, GERMANY- lmciumsm ron cononme Aim Ercnme PAPER wnns AND THE LIKE AND METHOD 'rnnnnor.

Application filed August 17, 1925, Serial No. 50,564, and in Germany October 9, 1924.

My invention relates to a method and a mechanism for the application of colors, etching and dissolving liquids, etc., in the form of atterns, on paper webs and the like, prefera ly during the manufacture of the web, i. e. while the paper web is still in the wet state.

The ob'ect of the invention is to provide paper we s, especially those of little resistance and which are still in the nascent state with an application of colors or other sorts of liquid in the form of patterns by which existing colors may be influenced.

In the methods heretofore known, the colors or the like are applied to the web by means of a moistened roll over which the web runs and which is counteracted at the other side of the web by a pressure roll, in order to press the web against the patterns of the sa d moistened roll. The patterns of the latter, in this case, have to be built up of solid material such as rubber, metal or the like, in order to withstand the pressure of the said pressure roll. This means, however, is not favorable for the feeding bf the liquid by the pattern roll, as the adhesion of the smooth surface of such materials is not great enough to warrant a suflicient form distribution of same all over the surface, especially when the projecting surfaces of the pattern roll are large. Moreover, these methods are not applicable to paper webs which are still in the nascent or wet state, as the webs would be destroyed between the two rolls in consequence of t e exerted pressure.

These disadvantages are overcome by the invention by providing for the application of the liquid to a roll, which, due to the formation of its surface, requires no particular pressure for transmitting the li uid to the web. For this purpose, an application roll with an absorbing surface is used. The paper web or the like runs over the application roll without any particular pressure, only by virtue of the weight of a portion of its length. Because there is no pressure, the coating of the application roll allows of the use of such soft material, as is required for the designed purpose.

Two constructional forms of device, by

means of which the method in question may b be executed, are represented in the accompanying drawings in which Fig. is a diagrammatic section throu h an apphance for the application of the hqquantity of liquid and a uni below that of the uid to the web, Fig. 2 is a diagrammatic section throu h a similar appliance showing some additional features for practicing the novel method.

Fig. 3 is a side view of the rolls employed in the construction of Figs. 1 and 2.

The same reference characters indicate corresponding parts in both figures.

According to Fig. 1, the liquid a to be applied is stored in a basin, in which a transmitting roll 6 is partiall immersed. Above the transmitting roll an in contact with the same is located an application roll 0 which carries on its circumference an absorbing coating 0 in form of the pattern to be transmitted. The web e runs on'the upper side of the application roll a and is guided before and behind the application roll by means of guiding rolls (Z in a suitable manner.

Along the lines of the foregoing description, the operation of the device, by which the new method is represented, is easily to be understood. The transmission of the liquid to the web takes place without the employment of any pressure against'the web on its other side and against the application roll. The whole mechanism is very simple, because a counterpressure roll is not necessary. The slight pressure exerted by the weight of the web results in applying the liquid to the web, when the latter is still in the wet state, whereby the eflect of coloring or etching is of course much better and more profound th 11 in the case of a thoroughly dr web. Besides, for the absorbing coating 0 the a plication roll such soft material may be used, as would be destroyed if a counter-pressure roll was acting upon it.

In carrying on the above described method, it was found that, for the transmission of the liquid between the transmitting and the application roll, an immediate contact between the two rolls is not necessary and that even a small distance may exist between them, which fills itself with liquid during the run. On the transmitting roll 6, a ring of liquid is formed by adhesion, in which the circumference of the ap lication roll a immerses. The quantity of liquid supplied to the application roll a may still be increased y running the transmitting roll 6 at a bi her speed than the former. It is even possib e to reduce the speed of the transmitting roll 6 application roll a, which method may be convenient for regulating the and being adapted be quite impossible in the case of an immediate contact between the two rolls, because,

' in this case, the soft and absorbing coating of the application roll would be destroyed in a short time. The adhesion of the transmitting roll 5 may be further increased by a suitable formation of its surface. For this purpose, small grooves of convenient form and depth are provided on the roll. by which a greater quantity of uid is delivered to the application roll;

ese

mitting roll, or by enveloping it in a suitable coating of textile. In the latter case, there results still the advantage that the suction effect of the textile helps in the transmitting of the liquid.- The softness of such threads or textiles on the transmitting roll allows even of slight contact between the two rolls, that might occur in consequence of accidental eccentricities, without destroying the soft coating of the application roll.

According to Fig. 2, the application roll 0 is supported by'bearings c which are mounted in guides f and arranged for movement towards and away from the centre of the transmitting roll I). Said bearings c are supported by pivoted arms g the free endsof which are adjustable to effect the vertical movement of the roll a with reference to the roll 6. ,The guiding rolls (1 are preferably ad'ustable in a horizontal direction towards an away from the application roll 0 as well as in a vertical direction. This may be effected by any suitable means not shown on the drawing. In this way, by adjusting the guiding rolls d towards the application roll a, it is possible to regulate the amplitude of the encircled are formed on the application roll a by the web 0 and in this way to keep the load on the coating of the roll as light as possible.

From the above described arrangement, the following advantages result: The speed of the transmitting roll I) is not bound to that of the ap lication roll 0. Accordingly, the quantity 0 liquid may be regulated by variation of the speed of rotation of either or both of said rolls. In consequence of the want of any immediate contact between the two rolls 6 and c, the coating of the latter is saved to to the utmost; even accidental excentricity is,

in certain limits, without any injurious influence, as well to the coating 0 as to the running of the device.

In Fig. 3 the pattern on the roll-c is indicated by the character it, and the textile covering for the roll I) is indicated by the letter 2.

The constructional arrangements represented by the diagrammatic views of the accompanying drawings are but examples, which illustrate the underlying conception claimed as the invention. Besides this, of course, all other forms of device and all modiooves may practically be produced, by W111 ing a thread or wire round the transfications of the described arrangements, which serve to carry out the method of applying liquids to a paper or similar web without a particular counterpressure and which might occur to those skilled in the art, fall within the scope of the invention.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a mechanism for coloring and etching paper webs and the like in the form of patterns, an application rollhaving a soft and liquid absorbing coating on the same, patterns formed onthe said coating; a transmitting roll disposed beneath the application roll so as to leave a small distance between the opposing surfaces of the two rolls; a liquid-carrying winding on the surface of the transmitting roll.

2. In a mechanism for coloring and etching paper webs and the like in the form of patterns, an application roll having a liquid absorbing coating on 1t; patterns formed on the said'coating; and a transmitting roll disposed beneath the application roll so as to leave a small distance between the opposing surfaces of the two rolls and a suitable coating of textile on the surface of the transmitting roll.

3. In a mechanism for coloring or etching paper webs and the like with patterns, the combination of a liquid transmitting roll partiall immersed in liquid to be applied and rotatab e therein whereby to carry a surface film of said liquid, and an application roll rotatably mounted above said transmitting roll, said application roll having a soft liq- Hid-absorbent coating adapted to transmit the liquid of said surface film to a web bearing on the upper side of said application roll.

a. In a mechanism for coloring or etching paper webs and the like, the combination of a liquid transmitting roll partially immersed 1n liquid to be applied and rotatable therein whereby to carry a surface film of said liquid, and an application roll rotatably mounted above said transmitting roll, said application roll being slightly spaced from the transmitting roll and characterized by a soft liquid-absorbent coating formed in patterns, said coating being adapted to transmit the liquid of said surface film to a travelling web bearing on the upper side of the application roll. I

5. In a mechanism for coloring or etching webs and the like with patterns, the combination of a liquid transmitting roll partially immersed in a liquid to be applied and rotatable therein to carry a surface film of said liquid, and an application roll rotatably mounted above said transmitting roll, said application roll having a soft liquid-absorbent coating carrying the outline of the patterns and adapted to transmit the liquid of said surface film to a web bearing on the upper side of said application roll to produce the patterns thereon.

6. The method of producing designs on surfaces which consists in coating a movable part with material to be transferred to said surface according to the pattern of the design, bringing an unfinished web containing moist adhering fibres into contact with the surface of said part bearing said material, causing said part and said web to move to transfer said material to the web and thus produce the design thereon, and causing the web to engage the surface of said part bearing said material with just sufficient pressure to enable the web to take up said material according to said design while in contact with said part.

7 The method of producing patterns on surfaces which consists in supplying to a part having an absorbent-surface bearing the desired design the material for forming said design on the first named surfaces, bringingan unfinished web containin moist adhesive fibres into contact with said absorbent surface, causing said web and said absorbent surface to move so as to transfer the material from said absorbent surface to the web, so as to form the design on the Web, and causing the web to engage the absorbent surface whenin contact with the latter with just sufficient pressure to enable said material to be transferred to the web according to the character of said design.

8. The method of producing designs on the surface of paper in the wet state in the course of manufacturing and before finishing, which consists in coating a movable part with material to be transferred to said surface according to the pattern of the design, causing the paper to make contact with said part bear ing said material, causing said part and said paper to move to transfer the material to the paper and thus produce the deslgn thereon, and causing the paper to engage the surface of said part bearing said material with just enough pressure to enable the paper to take up said material according to sa d design while said paper and said part are in contact with each other.

9. The method of producing patterns on the surface of wetpaper inthe course of manufacturing and before finishing, which consists in supplying to a part having an absorbent surface bearing the desired desi n the material for forming said design on the paper, causin the unfinished wet paper to make contact Wlfil said absorbent surface, causing said paper and said absorbent surface to move so as to transfer the material from said absorbent surface to the surface of the paper and form the design on the latter, and causing the paper to engage the absorbent surface when in contact with same with just enough pressure to enable said material to be transferred to the paper to produce the pattern desired.

10. In the manufacture of paper, the process of producing a designed sheet, which consists in passing the wet Web while in the course 0 manufacture and immediately it becomes capable of self support without the use of any supporting felt, into frictional contact with a wet design whereby to produce the-wetdesign upon the web, the frictional contact being a gentle contact accomplished solely by virtue of the weight of a portion of the webs length drawn over the wet design, and then continuing the manufacture of the paper, by simultaneously drying the wet web with the wet design thereon.

11. In the manufacture of paper, the process of producing a designed sheet, which consists in passing the wet web while in the course of manufacture and immediately it becomes capable of self support without the use of any supporting felt, into frictional contact with a design whereb to produce the wet design upon the web,t e frictional contact being a gentle contact accomplished solely by virtue of the weight of a portion of the webs length drawn over the wet design, the contacting wei ht of the web itself actuating the design, w ereby the wet design will be reproduced upon the web without 1njuriously efi'ectingzthe delicate material of the wet web.

Intestimony whereof I afiix my signature.

IIERMANN PALM. 

